diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
index b4958d6..5acb6fa 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
@@ -407,6 +407,7 @@
     if (InstanceNo > 0)
       VRBaseMap.erase(SDOperand(Node, ResNo));
     bool isNew = VRBaseMap.insert(std::make_pair(SDOperand(Node,ResNo),SrcReg));
+    isNew; // Silence compiler warning.
     assert(isNew && "Node emitted out of order - early");
     return;
   }
@@ -465,6 +466,7 @@
   if (InstanceNo > 0)
     VRBaseMap.erase(SDOperand(Node, ResNo));
   bool isNew = VRBaseMap.insert(std::make_pair(SDOperand(Node,ResNo), VRBase));
+  isNew; // Silence compiler warning.
   assert(isNew && "Node emitted out of order - early");
 }
 
@@ -522,6 +524,7 @@
     }
 
     bool isNew = VRBaseMap.insert(std::make_pair(SDOperand(Node,i), VRBase));
+    isNew; // Silence compiler warning.
     assert(isNew && "Node emitted out of order - early");
   }
 }
@@ -719,9 +722,11 @@
 
     if (VRBase) {
       // Grab the destination register
+#ifndef NDEBUG
       const TargetRegisterClass *DRC = MRI.getRegClass(VRBase);
       assert(SRC && DRC && SRC == DRC && 
              "Source subregister and destination must have the same class");
+#endif
     } else {
       // Create the reg
       assert(SRC && "Couldn't find source register class");
@@ -772,6 +777,7 @@
     assert(0 && "Node is not insert_subreg, extract_subreg, or subreg_to_reg");
      
   bool isNew = VRBaseMap.insert(std::make_pair(SDOperand(Node,0), VRBase));
+  isNew; // Silence compiler warning.
   assert(isNew && "Node emitted out of order - early");
 }
 
@@ -799,10 +805,10 @@
     unsigned NumResults = CountResults(Node);
     unsigned NodeOperands = CountOperands(Node);
     unsigned MemOperandsEnd = ComputeMemOperandsEnd(Node);
-    unsigned NumMIOperands = NodeOperands + NumResults;
     bool HasPhysRegOuts = (NumResults > II.getNumDefs()) &&
                           II.getImplicitDefs() != 0;
 #ifndef NDEBUG
+    unsigned NumMIOperands = NodeOperands + NumResults;
     assert((II.getNumOperands() == NumMIOperands ||
             HasPhysRegOuts || II.isVariadic()) &&
            "#operands for dag node doesn't match .td file!"); 
@@ -999,6 +1005,7 @@
       assert(I->Reg && "Unknown physical register!");
       unsigned VRBase = MRI.createVirtualRegister(SU->CopyDstRC);
       bool isNew = VRBaseMap.insert(std::make_pair(SU, VRBase));
+      isNew; // Silence compiler warning.
       assert(isNew && "Node emitted out of order - early");
       TII->copyRegToReg(*BB, BB->end(), VRBase, I->Reg,
                         SU->CopyDstRC, SU->CopySrcRC);
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
index 9c61ed8..f0d9f36 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
@@ -1317,6 +1317,7 @@
     void remove(SUnit *SU) {
       assert(!Queue.empty() && "Queue is empty!");
       size_t RemovedNum = Queue.erase(SU);
+      RemovedNum; // Silence compiler warning.
       assert(RemovedNum > 0 && "Not in queue!");
       assert(RemovedNum == 1 && "Multiple times in the queue!");
       SU->NodeQueueId = 0;
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index f79ad02..3cc8152 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -807,7 +807,7 @@
       unsigned NumRegs =
         TLI.getVectorTypeBreakdown(ValueVT, IntermediateVT, NumIntermediates,
                                    RegisterVT);
-
+      NumRegs; // Silence a compiler warning.
       assert(NumRegs == NumParts && "Part count doesn't match vector breakdown!");
       assert(RegisterVT == PartVT && "Part type doesn't match vector breakdown!");
       assert(RegisterVT == Parts[0].getValueType() &&
@@ -1024,6 +1024,7 @@
     DAG.getTargetLoweringInfo()
       .getVectorTypeBreakdown(ValueVT, IntermediateVT, NumIntermediates,
                               RegisterVT);
+  NumRegs; // Silence a compiler warning.
   unsigned NumElements = MVT::getVectorNumElements(ValueVT);
 
   assert(NumRegs == NumParts && "Part count doesn't match vector breakdown!");
@@ -3752,14 +3753,13 @@
     // If this is an expanded reference, add the rest of the regs to Regs.
     if (NumRegs != 1) {
       TargetRegisterClass::iterator I = PhysReg.second->begin();
-      TargetRegisterClass::iterator E = PhysReg.second->end();
       for (; *I != PhysReg.first; ++I)
-        assert(I != E && "Didn't find reg!"); 
+        assert(I != PhysReg.second->end() && "Didn't find reg!"); 
       
       // Already added the first reg.
       --NumRegs; ++I;
       for (; NumRegs; --NumRegs, ++I) {
-        assert(I != E && "Ran out of registers to allocate!");
+        assert(I != PhysReg.second->end() && "Ran out of registers to allocate!");
         Regs.push_back(*I);
       }
     }